CN114888274A - Intelligent casting method based on mold casting - Google Patents
Intelligent casting method based on mold casting Download PDFInfo
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- CN114888274A CN114888274A CN202210387902.XA CN202210387902A CN114888274A CN 114888274 A CN114888274 A CN 114888274A CN 202210387902 A CN202210387902 A CN 202210387902A CN 114888274 A CN114888274 A CN 114888274A
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- 238000005266 casting Methods 0.000 title claims abstract description 133
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000004512 die casting Methods 0.000 claims abstract description 24
- 238000004140 cleaning Methods 0.000 claims abstract description 18
- 239000002994 raw material Substances 0.000 claims description 22
- 238000010422 painting Methods 0.000 claims description 17
- 238000010438 heat treatment Methods 0.000 claims description 16
- 238000003754 machining Methods 0.000 claims description 16
- 238000003723 Smelting Methods 0.000 claims description 13
- 239000007788 liquid Substances 0.000 claims description 13
- 238000001514 detection method Methods 0.000 claims description 8
- 238000011179 visual inspection Methods 0.000 claims description 8
- 239000000428 dust Substances 0.000 claims description 7
- 239000012535 impurity Substances 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 6
- 229910000838 Al alloy Inorganic materials 0.000 claims description 5
- 238000000465 moulding Methods 0.000 claims description 5
- 239000003973 paint Substances 0.000 claims description 5
- 239000004576 sand Substances 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 4
- 239000006260 foam Substances 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 238000005498 polishing Methods 0.000 claims description 4
- 238000011112 process operation Methods 0.000 claims description 4
- 239000004065 semiconductor Substances 0.000 claims description 4
- 230000003068 static effect Effects 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- 238000009423 ventilation Methods 0.000 claims description 4
- 238000005406 washing Methods 0.000 claims description 4
- 229910000617 Mangalloy Inorganic materials 0.000 claims description 3
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 3
- 239000000956 alloy Substances 0.000 claims description 3
- 238000000227 grinding Methods 0.000 claims description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 3
- 239000004973 liquid crystal related substance Substances 0.000 claims description 3
- 239000011701 zinc Substances 0.000 claims description 3
- 229910052725 zinc Inorganic materials 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 2
- 230000008018 melting Effects 0.000 claims description 2
- 238000005057 refrigeration Methods 0.000 claims 1
- 238000003860 storage Methods 0.000 claims 1
- 230000017525 heat dissipation Effects 0.000 abstract description 3
- 238000010923 batch production Methods 0.000 abstract description 2
- 238000004040 coloring Methods 0.000 description 3
- 238000002372 labelling Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D46/00—Controlling, supervising, not restricted to casting covered by a single main group, e.g. for safety reasons
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D2/00—Arrangement of indicating or measuring devices, e.g. for temperature or viscosity of the fused mass
- B22D2/006—Arrangement of indicating or measuring devices, e.g. for temperature or viscosity of the fused mass for the temperature of the molten metal
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D47/00—Casting plants
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/25—Greenhouse technology, e.g. cooling systems therefor
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention provides an intelligent casting method based on die casting, which belongs to the field of die casting. The invention can be intelligently controlled, reduces the casting strength, improves the casting efficiency, ensures the casting stability, can clean and process the casting to ensure that the casting is more stable and ordered, meets the requirement of batch production efficiency, fully solves the problems that the prior casting method does not have the casting surface cleaning function, does not have the heat dissipation protection function and has high casting strength, prolongs the service life of the casting die and improves the use stability of the casting die.
Description
Technical Field
The invention belongs to the technical field of mold casting, and particularly relates to an intelligent casting method based on mold casting.
Background
The casting mold is used for obtaining the structural shape of the part, other easily-formed materials are used for forming the structural shape of the part in advance, then the part is placed into the mold, a cavity with the same structural size as the part is formed in the sand mold, then the fluid liquid is poured into the cavity, and the part with the same structural shape as the mold can be formed after the fluid liquid is cooled and solidified.
Casting molds are an important part of the casting process.
The casting method in the prior art is widely applied.
However, the existing casting method has the problems of no casting surface cleaning function, no heat dissipation protection function and high casting strength.
Therefore, it is necessary to invent an intelligent casting method based on mold casting.
Disclosure of Invention
In order to solve the technical problems, the invention provides an intelligent casting method based on mold casting, wherein the intelligent casting method is realized by the following technical scheme:
the intelligent casting method based on the die casting specifically comprises the following steps:
the method comprises the following steps: preparing a casting raw material, pretreating the casting raw material, stirring and mixing the raw material, pouring the raw material into a smelting furnace for smelting to prepare a smelting casting liquid, then carrying out constant-temperature heating treatment, storing, carrying out internal cleaning on a casting mold, taking out impurities and dust, washing and drying the interior of the mold, and preparing for a casting process;
step two: the intelligent pouring casting process comprises the following steps:
the first step is as follows: the intelligent control detection operation comprises the steps that a casting mold is placed in an ultrasonic sensor and a temperature sensor, operation control is conducted through an external PLC (programmable logic controller) all-in-one machine, the liquid level condition injected into the casting mold can be detected through the ultrasonic sensor, the temperature of solution is detected through the temperature sensor in real time, casting standing operation can be conducted after detection of various indexes, an upper mold in the mold is driven to act through a PLC all-in-one machine control cylinder, and automatic opening and closing operation can be conducted;
the second step is that: the temperature heating control is realized, the casting temperature is detected through a temperature sensor, auxiliary heating can be realized through a heating sheet embedded in the mold, auxiliary cooling is realized through a built-in semiconductor refrigerating sheet in a casting static state, the casting efficiency is improved, and intelligent control operation is realized in real time through a PLC integrated machine;
step three: the casting part forming and processing operation specifically comprises the following steps:
the first step is as follows: taking out a casting part, namely opening a mould, taking out a molded mould casting blank, cleaning the surface of the mould casting blank by a sand grinder, removing burrs and redundant blanks, finishing the surface, and then performing fine machining operation of a lathe;
the second step is that: performing fine machining operation on a lathe, namely placing the polished die casting blank into a numerical control lathe, performing deep cleaning on the surface, performing deep machining, hole opening and hole expanding operation, performing machining treatment at each level, taking out the formed blank again, and preparing for subsequent process operation;
step four: the processing operation of the outer surface of the blank specifically comprises the following steps:
the first step is as follows: checking the surface of the blank, taking out the processed blank, placing the processed blank on a bright workbench for visual inspection, checking whether pits or cracks exist, performing remelting and recasting operations on the unqualified blank after the visual inspection, performing secondary finishing on the blank which can be finished, performing surface polishing and turning, and forming a finished die casting product after the processing;
the second step is that: painting the surface of the finished product of the die casting, painting the surface of the finished product of the die casting after molding, removing an oxide layer, painting for the second time, painting and coloring, labeling, and storing, thus performing subsequent use and processing operation;
step five: the mould is transported and is protected, and during the mould transportation, deposit the transportation through the foam case, dampproofing taking precautions against earthquakes to avoid sunshine insolateing, arrange the greenhouse environment in under, timely ventilation protection.
Preferably, in the step one, the pretreatment mainly comprises impurity removal of raw materials, rust removal and dust removal, and the main raw materials comprise manganese steel materials, zinc materials and aluminum alloy materials.
Preferably, in the second step, the ultrasonic sensor and the temperature sensor in the first step are connected with an external PLC all-in-one machine through wires, wherein the ultrasonic sensor is an M18 type ultrasonic sensor, the temperature sensor is a PT100 type temperature sensor and is arranged in a non-contact manner with the smelting and casting liquid, and the PLC all-in-one machine adopts an embedded FX2N-48 type PLC touch liquid crystal control all-in-one machine.
Preferably, in the second step, the casting temperature in the second step is set to 100-150 ℃, and the cooling temperature is set to 0-15 ℃.
Preferably, in step three, the burr removal in the first step is performed by using an electric grinder.
Preferably, in step four, the painting color in the second step is a red paint layer or a green paint layer.
Preferably, in the fourth step, the label in the second step is marked by using an aluminum alloy label.
Compared with the prior art, the invention has the following beneficial effects: the intelligent casting method based on the die casting is widely applied to the technical field of die casting. The invention can be intelligently controlled, reduces the casting strength, improves the casting efficiency, ensures the casting stability, can clean and process the casting to ensure that the casting is more stable and ordered, meets the requirement of batch production efficiency, fully solves the problems that the prior casting method does not have the casting surface cleaning function, does not have the heat dissipation protection function and has high casting strength, prolongs the service life of the casting die and improves the use stability of the casting die.
Drawings
Fig. 1 is a flow chart of an intelligent casting method based on mold casting.
FIG. 2 is a flowchart of the intelligent pour casting process.
FIG. 3 is a flow chart of a casting forming operation.
Fig. 4 is a flowchart of the outer surface processing operation of the blank member.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
in the figure:
as shown in figure 1
The intelligent casting method based on the die casting specifically comprises the following steps:
s101: preparing a casting raw material, pretreating the casting raw material, stirring and mixing the raw material, pouring the raw material into a smelting furnace for smelting to prepare a smelting casting liquid, then carrying out constant-temperature heating treatment, storing, carrying out internal cleaning on a casting mold, taking out impurities and dust, washing and drying the interior of the mold, and preparing for a casting process;
s102: the intelligent pouring and casting process is shown in the attached figure 2 and specifically comprises the following steps:
s201: the intelligent control detection operation comprises the steps that a casting mold is placed in an ultrasonic sensor and a temperature sensor, operation control is conducted through an external PLC (programmable logic controller) all-in-one machine, the liquid level condition injected into the casting mold can be detected through the ultrasonic sensor, the temperature of solution is detected through the temperature sensor in real time, casting standing operation can be conducted after detection of various indexes, an upper mold in the mold is driven to act through a PLC all-in-one machine control cylinder, and automatic opening and closing operation can be conducted;
s202: the temperature heating control is realized, the casting temperature is detected through a temperature sensor, auxiliary heating can be realized through a heating sheet embedded in the mold, auxiliary cooling is realized through a built-in semiconductor refrigerating sheet in a casting static state, the casting efficiency is improved, and intelligent control operation is realized in real time through a PLC integrated machine;
s103: the casting forming operation, as shown in fig. 3, specifically includes the following steps:
s301: taking out and cleaning a casting part, opening a mold, taking out a molded mold casting blank, cleaning the surface of the mold casting blank by a sand grinding machine, removing burrs and redundant blanks, and performing fine machining operation of a lathe after surface finishing;
s302: performing fine machining operation on a lathe, namely placing the polished die casting blank in a numerical control lathe, performing deep cleaning on the surface, performing deep machining, hole opening and hole expanding operation, performing machining treatment at all levels, taking out the molded blank again, and preparing for subsequent process operation;
s104: the processing operation of the outer surface of the blank, as shown in fig. 4, specifically includes the following steps:
s401: checking the surface of the blank, taking out the processed blank, placing the processed blank on a bright workbench for visual inspection, checking whether pits or cracks exist, performing remelting and recasting operations on the unqualified blank after the visual inspection, performing secondary finishing on the blank which can be finished, performing surface polishing and turning, and forming a finished die casting product after the processing;
s402: painting the surface of the finished product of the die casting, painting the surface of the finished product of the die casting after molding, removing an oxide layer, painting for the second time, painting and coloring, labeling, and storing, thus performing subsequent use and processing operation;
s105: the mould is transported and is protected, and during the mould transportation, deposit the transportation through the foam case, dampproofing taking precautions against earthquakes to avoid sunshine insolateing, arrange the greenhouse environment in under, timely ventilation protection.
Preferably, in S101, the pretreatment mainly includes removing impurities and removing rust and dust from the raw materials, and the main raw materials include manganese steel material, zinc material and aluminum alloy material.
Preferably, in S102, the ultrasonic sensor and the temperature sensor in S201 are both connected to an external PLC integrated machine through wires, wherein the ultrasonic sensor is an M18 ultrasonic sensor, the temperature sensor is a PT100 temperature sensor and is arranged in a non-contact manner with the melting and casting liquid, and the PLC integrated machine is an embedded FX2N-48 PLC touch-control liquid crystal control integrated machine.
Preferably, in S102, the casting temperature in S202 is set to 100-.
Preferably, in S103, the removing of the burrs in S301 is performed by using an electric grinder.
Preferably, in S104, the painting color in S402 uses a red paint layer or a green paint layer.
Preferably, in S104, the label in S402 is marked with an aluminum alloy label.
Detailed description of the preferred embodiment
1. Preparing a casting raw material, pretreating the casting raw material, stirring and mixing the raw material, pouring the raw material into a smelting furnace for smelting to prepare a smelting casting liquid, then carrying out constant-temperature heating treatment, storing, carrying out internal cleaning on a casting mold, taking out impurities and dust, washing and drying the interior of the mold, and preparing for a casting process;
2. the intelligent pouring casting process comprises the following steps:
the first step is as follows: the intelligent control detection operation comprises the steps that a casting mold is placed in an ultrasonic sensor and a temperature sensor, operation control is conducted through an external PLC (programmable logic controller) all-in-one machine, the liquid level condition injected into the casting mold can be detected through the ultrasonic sensor, the temperature of solution is detected through the temperature sensor in real time, casting standing operation can be conducted after detection of various indexes, an upper mold in the mold is driven to act through a PLC all-in-one machine control cylinder, and automatic opening and closing operation can be conducted;
the second step is that: the temperature heating control is realized, the casting temperature is detected through a temperature sensor, auxiliary heating can be realized through a heating sheet embedded in the mold, auxiliary cooling is realized through a built-in semiconductor refrigerating sheet in a casting static state, the casting efficiency is improved, and intelligent control operation is realized in real time through a PLC integrated machine;
3. the casting part forming and processing operation specifically comprises the following steps:
the first step is as follows: taking out and cleaning a casting part, opening a mold, taking out a molded mold casting blank, cleaning the surface of the mold casting blank by a sand grinding machine, removing burrs and redundant blanks, and performing fine machining operation of a lathe after surface finishing;
the second step: performing fine machining operation on a lathe, namely placing the polished die casting blank into a numerical control lathe, performing deep cleaning on the surface, performing deep machining, hole opening and hole expanding operation, performing machining treatment at each level, taking out the formed blank again, and preparing for subsequent process operation;
4. the processing operation of the outer surface of the blank specifically comprises the following steps:
the first step is as follows: checking the surface of the blank, taking out the processed blank, placing the processed blank on a bright workbench for visual inspection, checking whether pits or cracks exist, performing remelting and recasting operations on the unqualified blank after the visual inspection, performing secondary finishing on the blank which can be finished, performing surface polishing and turning, and forming a finished die casting product after the processing;
the second step is that: painting the surface of the finished product of the die casting, painting the surface of the finished product of the die casting after molding, removing an oxide layer, painting for the second time, painting and coloring, labeling, and storing, thus performing subsequent use and processing operation;
5. the mould is transported and is protected, and during the mould transportation, deposit the transportation through the foam case, dampproofing taking precautions against earthquakes to avoid sunshine insolateing, arrange the greenhouse environment in under, timely ventilation protection.
The technical solutions of the present invention or similar technical solutions designed by those skilled in the art based on the teachings of the technical solutions of the present invention are all within the scope of the present invention.
Claims (8)
1. The intelligent casting method based on the die casting is characterized by comprising the following steps:
the method comprises the following steps: preparing a casting raw material, pretreating the casting raw material, stirring and mixing the raw material, pouring the raw material into a smelting furnace for smelting to prepare a smelting casting liquid, then carrying out constant-temperature heating treatment, storing, carrying out internal cleaning on a casting mold, taking out impurities and dust, washing and drying the interior of the mold, and preparing for a casting process;
step two: intelligent pouring and casting process;
step three: molding and processing operation of the casting part;
step four: processing the outer surface of the blank;
step five: the mould is transported and is protected, and during the mould transportation, deposit the transportation through the foam case, dampproofing taking precautions against earthquakes to avoid sunshine insolateing, arrange the greenhouse environment in under, timely ventilation protection.
2. The intelligent casting method based on mold casting according to claim 1, wherein in the second step, the intelligent pouring casting process specifically comprises the following steps:
the first step is as follows: the intelligent control detection operation comprises the steps that a casting mold is placed in an ultrasonic sensor and a temperature sensor, operation control is conducted through an external PLC (programmable logic controller) all-in-one machine, the liquid level condition injected into the casting mold can be detected through the ultrasonic sensor, the temperature of solution is detected through the temperature sensor in real time, casting standing operation can be conducted after detection of various indexes, an upper mold in the mold is driven to act through a PLC all-in-one machine control cylinder, and automatic opening and closing operation can be conducted;
the second step is that: temperature heating control detects the casting temperature through temperature sensor, can carry out auxiliary heating through embedded heating plate in the mould, and during the casting static simultaneously, the rethread built-in semiconductor refrigeration piece carries out supplementary cooling, improves casting efficiency, carries out intelligent control operation in real time through the PLC all-in-one.
3. The intelligent casting method based on mold casting according to claim 1, wherein in step three, the casting forming operation specifically comprises the following steps:
the first step is as follows: taking out and cleaning a casting part, opening a mold, taking out a molded mold casting blank, cleaning the surface of the mold casting blank by a sand grinding machine, removing burrs and redundant blanks, and performing fine machining operation of a lathe after surface finishing;
the second step is that: and (3) fine machining operation of a lathe, namely placing the polished die casting blank into a numerical control lathe, performing deep cleaning on the surface, performing deep machining, hole opening and hole expanding operation, performing machining treatment at all levels, taking out the molded blank again, and preparing for subsequent process operation.
4. The intelligent casting method based on mold casting according to claim 1, wherein in step four, the external surface processing operation of the blank specifically comprises the following steps:
the first step is as follows: checking the surface of the blank, taking out the processed blank, placing the processed blank on a bright workbench for visual inspection, checking whether pits or cracks exist, performing remelting and recasting operations on the unqualified blank after the visual inspection, performing secondary finishing on the blank which can be finished, performing surface polishing and turning, and forming a finished die casting product after the processing;
the second step is that: the surface painting operation of the finished product of the die casting part is to perform the surface painting operation of the finished product of the die casting part after the molding processing, firstly perform the operation of removing oxide layer, then perform the operation of secondary painting, paint and color, label the product, prepare for storage, and then perform the subsequent use and processing operation.
5. The intelligent casting method based on mold casting according to claim 1, wherein in the step one, the pretreatment mainly comprises impurity removal of raw materials, rust removal and dust removal, and the main raw materials comprise manganese steel materials, zinc materials and aluminum alloy materials.
6. The intelligent casting method based on mold casting as claimed in claim 2, wherein in the second step, the ultrasonic sensor and the temperature sensor in the first step are connected and arranged with an external PLC all-in-one machine through wires, wherein the ultrasonic sensor is an M18 type ultrasonic sensor, the temperature sensor is a PT100 type temperature sensor and is arranged in a non-contact manner with the melting and casting liquid, and the PLC all-in-one machine adopts an embedded FX2N-48 type PLC touch liquid crystal control all-in-one machine.
7. The smart casting method based on mold casting as claimed in claim 2, wherein in the second step, the casting temperature is set to 100-150 ℃ and the cooling temperature is set to 0-15 ℃.
8. The intelligent casting method based on die casting according to claim 3, wherein in step three, the burr removal in the first step is performed by using an electric grinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210387902.XA CN114888274A (en) | 2022-04-13 | 2022-04-13 | Intelligent casting method based on mold casting |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210387902.XA CN114888274A (en) | 2022-04-13 | 2022-04-13 | Intelligent casting method based on mold casting |
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| CN114888274A true CN114888274A (en) | 2022-08-12 |
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| CN101927337A (en) * | 2010-07-27 | 2010-12-29 | 重庆福德助友农业机械有限公司 | Technical process for casting cylinder cover and engine body component of diesel engine |
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| CN215144596U (en) * | 2020-12-26 | 2021-12-14 | 宜宾正集源智能科技有限公司 | Die-casting control system is used in smart mobile phone production |
| CN113814359A (en) * | 2021-09-06 | 2021-12-21 | 天津中科首创仪表有限公司 | Upper die gravity die-casting thin-wall metal casting process |
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2022
- 2022-04-13 CN CN202210387902.XA patent/CN114888274A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101927337A (en) * | 2010-07-27 | 2010-12-29 | 重庆福德助友农业机械有限公司 | Technical process for casting cylinder cover and engine body component of diesel engine |
| CN106311979A (en) * | 2015-06-26 | 2017-01-11 | 安徽丰瑞金属制品有限公司 | Cast piece processing technology |
| CN207941968U (en) * | 2018-03-14 | 2018-10-09 | 江西克王精密制造有限公司 | A kind of hot investment casting automation casting control device |
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| CN111266551A (en) * | 2020-02-04 | 2020-06-12 | 西安交通大学 | Semi-solid short-process intelligent manufacturing system and method for steel flat flange |
| CN111957936A (en) * | 2020-08-24 | 2020-11-20 | 江西台德智慧科技有限公司 | Production process control system based on intelligent manufacturing |
| CN215144596U (en) * | 2020-12-26 | 2021-12-14 | 宜宾正集源智能科技有限公司 | Die-casting control system is used in smart mobile phone production |
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| CN113814359A (en) * | 2021-09-06 | 2021-12-21 | 天津中科首创仪表有限公司 | Upper die gravity die-casting thin-wall metal casting process |
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